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Formation of high spin and low spin complexes depend totally on type of ligand. In case of octahedral complexes, the weak-field ligands give rise to small Δo and thus are high spin while strong-field ligands give rise to large Δo and are low spin.
configurations, d⁴, d⁵ ,d⁶, d^{7 have the tendency to show both high spin and low spin complexes depending upon the type of ligamd attached to the  central metal atom.}